Regulator for induction-coils



(NoMod eL) Y M. M. M. SLATTERY.

REGULATOR FOR INDUGTIbN OOILS.

No. 358,493. Patented Mar. 1, 1887.

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MARMA EUKE M. M. SLATTERY, OF \VOBURN, MASSACHUSETTS, ASSIGNOR TO THE SUN ELECTRIC COMPANY, OF MAINE.

REGULATOR FOR INDUCTION-SOILS.

SPECIFICATION forming part of Letters Patent No. 358,493, dated March 1, 1887.

(No model.) 7

To all whom it may concern:

Be it known that I, MARMADUKE M. M. SLATTERY, of \Voburn, in the county of Middlesex and State of Massachusetts, have in= vented certain new and useful Improvements in Induction-Coils for Electric Currents, of which the following is a specification.

As is well known, induction coils or transformers of the electric current have heretofore been made and used in which a primary current from some independent source of generation has been employed in order to induce in a secondary coil or helix,and any external or working circuit in connection therewith, currents of either approximately the same or of a different quantity and tension. The regulation of the current in this secondary coil and circuit has been effected in various ways, among others by a movement of the core, usually 'of iron, within the helix, or of a metallic cylinder or shield on the outside. This operation, as well as the other modes of regulation, has been found to present difficulties which my present method of regulation avoids, the object of this invention being to so construct and arrange the coil, in combination with an auxiliary electromagnetic device, as that the apparatus shall be perfectly and automatically regulated under all conditions of the external or working circuit.

The mode of effecting regulation which I employ is, briefly, the cutting out of successive coils or sets of coils of the generator to compensate for the successive removal of translating devices form the secondary circuit, or vice versa, and this I do by means of a regulating electromagnetic device (preferably of the construction shown) in connection with the secondary circuit, short circuits or cut-outs around certain sections of the coils furnishing current being automatically closed or opened thereby.

As shown in the drawings, this electromagnetic device consists of a movable core adapted to operate spring contact-pieces, and a solenoid which is compound wound, as having been found in practice to give the best results, the main secondary wire and derivation therefrom both being utilized to act upon the movable core. I do not claim this as essential,as

the main secondary alone, ora shunt alone, might be used, but not so efi'ectively or satisfactorily. This mode of regulation may be applied to any form of generator of this character; but the kind constructed with a number of superimposed disks, alternately primary and secondary, lends itself very readily to this apparatus, and is therefore shown in the drawlugs.

I do not desire to be understood as limiting myself to any particular form of construction, as those skilled in the art will readily understand t-hat the mechanical details and construction may be largely varied without departing from the gist of the invention.

Again referring to the drawings, in which similar letters indicate similar parts, Figure 1 shows the general disposition of the parts; Fig. 2, the manner in which the disks are superimposed and connections made with them.

A A B B are respectively the primary and secondary coils of the induction-coil, which is in the circuit of any suitable dynamo-electric machine or other generator of current, G.

O is the main secondary circuit, and D D, &c., are translating devices interposed therein.

E is a solenoid containing a movable core, F, provision being made for regulation by a light tension-spring, H.

I I I" I I l l l I are spring metallic strips connected, as at K K, to the primary coil of the secondary generator at points along its length, so as to fornnwhen the two ends ot'adjacent strips (shown open in the drawings) are in contact, a metallic short circuit or cutthe primary.

In addition to the main lead 0 of the secondary circuit, which passes around the solenoid E, a derived circuit (shown at L L) is also wound on it.

The drawings indicate that the whole of the translating devices are in operation. When, however, no current is called for in the secondary circuit, no work will be done in the primary, the whole number of contact-strips will be pressed together by the weight of the movable core, and the main current will pass through the extreme contact-strips onto the main line, also passing through the coils of the primary, but doing no work therein. Now, let there be interposed in the circuit of the secondary a lamp or other translating device, work will be called for in the primary out of no resistance around a coil or coils of p circuit, the generator will respond, (it being of course assumed that it is self-regulating by and of the well-known modes,) current will be induced in the secondary, the solenoid E in its circuit will be energized, the core F will.

be attracted within it, and two of the metallic contact-strips, 1 I, will be separated, opening the short circuit and allowing a coil or anumber of coils to come into operation. If, now, a second translating device be put in circuit, more work will be called for, more current will pass around the solenoid, the core will be still more attracted, another strip will be separated from the adjacent one, and another coil or set of coils allowed in come into operation for the development of the increased energy required. This operation is repeated until all the translating devices are in circuit, all the coils of the primary into operation,and the core fully attracted Within the solenoid, as shown in the drawings. On-removing translating devices the reverse action will take place.

It will be observed that in any improved method of regulation there is no waste of energy in substitute resistances or counter electro-motive force, the actual energy suspended in the coil being proportional to the calls of the external or working circuit. In the drawings of the form here shown of one mode of applying myinvention the disks,for the sake of distinctness, are shown as much thicker and more widely separated than in practice, when they are very numerous, very thin, and close together, except for insulation; also, for the sake of clearness, the relative proportions of the parts have not been preserved, the regulating-solenoid being actually very much smaller than the induction-coil itself.

Having thus explained my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. A regulator for induction-coils, consisting of a solenoid and movable core and suecessively-disposed contactpieces, such contact-pieces being connected with successive coils or sets of coils of the indnctioncoil.

2. In apparatus for generating secondary currents of electricity by induction, a primary coil having a number of normally-closed short or cut-out circuits connected thereto at intervals along its length, a secondary coil, and external circuit with translating devices therein,

a solenoid in the secondary circuit, a movable core therein, and contact-pieces disposed with relation thereto and forming the other terminals of said short or cut-out circuits, whereby, on increase of current in said solenoid, said core operates to successively open said cut-' out circuits.

3. In combination with an induction-coil, a cireuitin connection .with the secondary, in which is included a solenoid, and contactpieces or terminal points adj ustably disposed with relation to the core thereof, and to suecessive coils or sets of coils of the inductioncoil, whereby, on successive increases of current in said solenoid, said contact-pieces are successively separated.

4. An induction-coil consisting of a primary coil having derived or short circuits around certain sections thereof, and contact-pieces at the open ends thereof, a secondary coil, a solenoid included in a circuit therefrom, a movable core within said solenoid operated thereby, and adapted by means of said contact-pieces to close or open said derived circuits according to variations of current in said solenoid.

5. As a regulator for electric circuits operated by secondary generators, a solenoid in such circuit, or in a circuit derived therefrom, a core free to move within such solenoid, and a number of contact-pieces successively located in the line of movement of said core, or an extension thereof, such contact-pieces being connected with successive sections or coils of such generator.

6. In an induction-coil, a primary coil having derived or out-out circuits around sections thereof, separable contact-points in such circuit, and a solenoid in the circuit of the generator, the core of which solenoid is adapted, by means of said separable contact-points, to open or close said derived circuits or varia tions in the external or working circuit.

7. In combination with an electric circuit 9 operated by an induction-coil, an electro-magnctic device in connection with such circuit, and contact-strips and connections for successively removing from action coils or sets of coils in reponse to variations in the external or working circuit.

MARllIADUKE M. M. SLA'ITERY.

\Vitnesses:

J. E. TALBOT, E. 0. Loon. 

